Can Halvyn check the contents of an API response?

Yes. Use a JSON path assertion to require a field or a specific value, or a keyword check on the raw body.

Does it work with APIs that need a token?

Yes. HTTP monitors support Basic, Bearer and API-key authentication, and you can add any custom headers.

Will a slow API trigger an alert?

Set a response-time threshold. Checks above it are marked degraded, which is separate from down, so you can see slowdowns before they become outages.

Features / REST API monitoring

REST API monitoring

An API can return 200 and still be broken. Halvyn calls your endpoints on a schedule with the method, headers and credentials you choose, checks the body as well as the status, and opens one incident when the answer is wrong.

What Halvyn checks

GET, HEAD, POST, PUT, PATCH and DELETE, with your own headers and request body
Basic, Bearer token and API-key authentication, with the key sent in a header or the query string; credentials are encrypted at rest
Expected status codes you define, plus a separate list of statuses that count as degraded instead of down
JSON path assertions: confirm a field exists or equals an expected value, for example status or data.items.0.healthy
Keyword present or absent in the response body
Response time with a slow-response threshold, so a sluggish API is flagged before it fails

Common uses

Public and partner REST APIs
Internal service health endpoints
Login, search and checkout endpoints
Webhook receivers and third-party integrations you depend on

Included with every monitor

One incident per outage

Repeated failures roll into a single incident with a timeline, instead of a flood of duplicate alerts.

Blip recheck

A failed check is re-run within the same cycle before it counts, and an incident opens only after consecutive failures — a single network blip never pages anyone.

Escalation until acknowledged

Email, Slack, Microsoft Teams, Discord, Google Chat, webhooks, SMS, voice calls and on-call rotations — with one-click acknowledge links in every alert.

Incident management

Investigating → identified → monitoring → resolved states, assignees, comments, SLA timers per severity and postmortems.

Public status pages

Uptime bars, live incidents and manual updates on a page you can put on your own domain.

Maintenance windows

Checks keep running during planned work but alerts stay quiet, so your history stays complete.

SLOs and monthly SLA reports

Track objectives per monitor and email an uptime report to owners every month.

Flat pricing

One price per plan, with every check type on paid plans (browser checks on the higher plans) — no per-host, per-check or per-feature metering.

Frequently asked questions

Can Halvyn check the contents of an API response?: Yes. Use a JSON path assertion to require a field or a specific value, or a keyword check on the raw body.
Does it work with APIs that need a token?: Yes. HTTP monitors support Basic, Bearer and API-key authentication, and you can add any custom headers.
Will a slow API trigger an alert?: Set a response-time threshold. Checks above it are marked degraded, which is separate from down, so you can see slowdowns before they become outages.

Start monitoring in five minutes

Free forever plan for HTTP monitoring. No credit card. Every check type on paid plans.

Create a free account